Jack



March 8, 1932. w. c. BRINTON JACK i IN'VENTOR ATTORNEYS Patented Mar.1.932

y broken away,

Lvention, and

WILLARD c. RRINTON, oENEW YORK, Y., AssIGNoR To TERMINAL ENGINEERINGCOMPANY, INC., or NEW YORK, N. Y., A'CoRPoRATIoN 0E NEwYoRK A i 'JACKOriginal application filed anuary9f1923, Serial No. 611,568. Divided andthis application iled November Q 21, 1928. serial No. 321,283.

but it should `be understood that the structure isA capable of generalapplication'and ofV use in any1 device where j acks' arejemployed.

Theinvention Vha's'for its salient object to 1 provide a "jack structurethat is' simple and practical in construction, can fbe readilyassembled, and is so designed lthat the maxi'- [mum lift or stroke canbe ,obtained for a niinirnumover-all dimension or length. y Furtherobjects ofthe invention will appear from the following specicationtakenin connection with the drawings, which form a part of this application,andin'which z Fig.1 is atop plan view of a 'jack-struc?, I

in accordancewith the 1n.

tureV constructed Fig. 2. 's a'sectional elevatiom'partly of thestructureshown 1n The jack structure 'briefly `describedV comprises ahousing, a thimble rotatably'mounted in the housing', and a jack lscrewdisposed in the thimble Sand operative connections Vwhereby as thethimble is rotated the :jack

screw -wil'l be elevated 'or lowered;` vThe end thrust is taken by athrust bearing disposedbetween theupperend ofthe-thimble and the lowerend of the :housing and ofrelatively largeV diameter` whereby thethimble will vbe supported. without adding toxthe'length :of

' the over-alldimension fofthe'jack structure.

assembling lor removal ofthe structure car-y The thimbleismountedaround. a bushing. and a bearing isidispo'sed between the bushingand spindle in alinement withxa sprocket wheel by which the thimble isrotated. yThus the thrust of the Vchain on' the. sprocket wheel istaken'u'p bythe'bearing. In addition to these Jfeatures, the thimble andjack structure l-areso mounted inthe housing as'to facilitate theassembling of the parts and alsothe. disf ried .thereby from f thehousing..

:pear from thelfollowing description.,vv j

.PATENT- olficitfVIA V.The detailed construction..'ofi.the jack yshowninFigs. 1 and 2 willnow' be described. The .various parts of thejack are supported in a housing 70 which is designed to `be mounted incorners of the vehicle frame ,10to

VAthe-housing 70 and projecting downwardly out of the latter, Yis athimble 72 .of the form,

shown which .atjits upper end fis provided withfa sprocket or pulley '.73 adapted to receive-the driving chain orV rope 22. VInterposed .betweenthe lower part of the housing Y, '70.l and the `toppartofthe.thimb1e-72is a over-all' length of thejack.` j

Y Arranged within `and supported byi the Ythimbl'e 72 is a vjackscrew76, whicli at its A,55 whichit Vis securedfby'cap screws 71 o'rfinjany othersuitable manner.Y Supportedby lower end is provided witha'squaredend78 A i' .adapted tofenter a 'square hole throughthe.bottom'of the thimble 72;. The bottom: end

-of the-thimble 7 2, adjacent both ;-ends'i-of thev .to lia-t surfacesso that Vflange 79 on the screw, i

76 may seat-properly on the bottomof` the thimble 7 2, and so that awasher 84 secured byl a cap screw 82 to -the' squared end ,78 of. the

` jack screw may seat properly againstthebot-v tom of the thimble 7 2.As'shown in FggQ, l

the `capscrewv82 is prevented from accidental loosening by means ofv awire' threaded through 4a holetherein' and-holes inthe outer end'ofthetthi1nble72. With this construc- .tionit'jwill be obvious that the jackscrew 7 6V rotatable with the with the jackscrew 7 64 The nut 87 may be.Y'

Vconveniently-made of Babbitt-metal, in-a .Well knownmanner. Theelevating quillV 86 is vprovided with key-ways 88 and -with 'a flange 90at its bottomend, for purposes herei e inafter described. At its'upperend the quill Further detailsof the invention will arp-W86 isclosedbyascrew plug 91of" the form adapted to receive a screw driver. Rotatablymounted in a recess in the top of the jack screw 7 6 is a ball 93 whichengages the inside of the plug 91 when the quill 86 is in its lowermostposition, thereby limitingl the downwardmovement of the latter.Securedin the top of the housing 70 is a bushing 95 which.

serves as a guide for the elevating quill 86. The form of thisV bushingwill be apparent' from Figs. 1 and 2, from which it' will'be evi# dentthat the bushing is provided with our radially extending lugs 97 adaptedto fit in recessesV in the housing 70. The bushing 951 the quill 86 butalso serves fas a guide bear-V ing for the thimble 72, rollers1041'being preferably interposed between the. thimble 7 2 and-thezbushing 95 in ord'erfto reduce the ffriction between those parts toa minimum. j Attent-ionr is called tothe fact that the'rollersv 1011a'redi'sposed in line `withror inthe plane of the sprocket wheel 73 `andthus take the chain thrust'. The bushing95` also serves to support keys105 whichmay bersecuredv therein f in any suitablemanner and entertheley-ways l88 in the quillV 86,- thereby preventing `thelatterfrom'rotating The mode of operation of the lj ack just de- Vscribed will be obvious. lRotation ofthe thim- V .ble 72, through themedium of the jack or cable 22V which isin engagement with the sprocketorV wheel 73, causes rotation ofthe jack screw 76. As the jack ,screw'76is rotated, Vthe nut 87'a'nd the quill 86, to which said 'nut isattached, move axially, being-pre- 'vente'd'fror'n rotary movement bytheengage.-

ment of the key-ways 88 withthe keys 105. The quill 86 is limited in itsupward movement by the engagement ofthe flange 90 with ne bottom of thebushing 95 and the :downjwardinoveinent of the quill `86 is limited bythe engagement'ofV the plug 91-'withthe ball V93' iii-'the upper endofthe screw .76. The downward thrust of the quillSG, due'to thel'oadwh-ichit'is lifting, istransmitted through the nut'87tothe 'screw 76 and from the latter tothe thi-mble T2-which is supported on the thrustbearing' in the housing 70. The tendencyforthe thimble 72 to movelaterally is oifse'tby the guide bearingsfcomprising the rollers 104Linterposed vbetween the thimble 72 rand the bushing 95.

lVhen a pluralityof jacks ofthetypeiabove deseribedare to be driven insynchronism l byasinglechainor cable, the upper ends-of 1.` In ahoisting jack,a housing by which the'fjack may be supported,.a rotarythimble supported .by said housing and Vprojecting downwardly out of thelatter, a thrust bear- `ing'arranged between the lower part ofA saidhousing and the top.v partV of said thimble a jack screw arranged withinsaid thimble andsecured to thelatter at its bottom end, an elevatingquill-having anutcooperating with said-jack screw and arranged torVaxial mOfvementfwithin said' thimble,` a bushing removablylconneetedtosaidhousing and arranged to serve Y.asa guide 'for saidV quilLmeanscooperating with said quill and saidv bushing for restricting thequilltoaXial movement, a guide bearing between saidthimble and 'saidbushing,`andimeans fo'r'rotating said. thimble whereby the jack screw isrotated and the elevating quill is Ycaused to :move axially.

f 2. VIn a'hoi'sting jack, a housing by which the 1 j aclniayV besupported, a rotary thimble supported by said housing and projectingdownwardly out of the latter, athrustbearing arranged'` between thelower part offsaid housing and the top part of said thimble',"a jacksorew'arrangedwithin said thimble'and secured to the latterat itsbottomend,- an elevatingquill having fa nut cooperatingwith said jack screwandarranged for aXialmoveinentwithinsaid thi'mble, a` bushing connectedto said'housing and arranged toserve asa guide for said quill, a bayonetconnection between said bushing and said housing adapt- -ed to permitthe bushingto be removably connected to said housing in a. plurality ofannular positions, .means cooperating with said 4quill and said bushingfor restrictingthe quill 'to axial movement, `a guide bearing betweensaid Athirnbley andsaid bushing, and means'ior rotating said thimblewhereby the jackscrew Vis rotated and the elevating'zquill is caused to.move axially. Y

3. In a hoisting jack, a housing by which the jack may be supported, arotary thimble supported by said housing andi projecting downwardly. outof the lattersaidthimble having atz .its `top a driving wheel integraltherewith, a thrust 'bearing arranged between the lowerpart ofjsaidhousing and a top of said thimble below said drivingwheeh aij ack l'screw arranged within said thimble and sev cured to the latter at itsbottom end, an elevating quill having a'nut cooperating with said jackscrew and arranged for axial movement Within said thimble, a bushingconnected to said housing and arranged to serve as a guide for saidquill, means cooperating with said quill andsaid bushing for restrictingthe quill to axial movement, and a guide bearing between the top of saidthimble and said bushing. v

WHJLARD C. BRINTON.

